solid state fermentation

Ergosterol can be assayed and used to estimate of fungal biomass.
See the chapter by J-E Nylund in Methods in Microbiology 1992 edited by
Read, D.; Norris and Varma. There were two vols. with those editors that
were dedicated to mycorrhizal techniques...
Email me directly for the complete citation (its at the office).
todell at u.washington.edu